In addition, we certify a large proportion of scoured wool for Length After Carding (LAC). To do this, we use a standardized method of simulating semi-worsted processing to estimate mean fiber length after processing. We also test for:

Residuals – the amount of mineral matter and residual grease left on the fibers after scouring, indicating scouring efficiency

pH – the acidity or alkalinity of the wool after scouring affects the dyeing process, so it is important for processors to know the pH value

Alkali solubility and extent of bleaching – solubility is used to assess fiber damage, while the extent of bleaching is important in some processes

Medullation – refers to the hollow fibers in wool and other animal fibers, which causes uneven dye uptake and adversely affects appearance in apparel wools (but may be desirable for some carpet types)

Bulk – this measures the fibers’ ability to fill space and also relates to resilience, which are important properties for applications such as carpets, futons and insulation

Fiber curvature – relates to bulk, compressibility and crimp and is cited as an influence on processing

Fiber diameter distribution – information about aspects of the diameter distribution may affect assessments of comfort and processing performance

Detergent residuals – wools intended for certain markets must be scoured with detergents that do not contain nonyl phenol ethoxylate (NPEO)

Mothproofing treatments – these must comply with the appropriate regulations

Sanitary reports – shipments to certain destinations require an inspection report confirming that any residual vegetable matter is non-viable, while other places may require sanitization procedures to be verified